Diamine substitution reactions of tetrahydrate succinato nickel, cobalt, and zinc coordination polymers
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Investigation on the substitution reactions of tetrahydrate succinato metal coordination polymers with diamine ligands results in the isolations of four new coordination polymers, [M(suc)(bpy)(H2O)(2)](n).nH(2)O (M = Ni, 2; M = Co, 2a), [Ni(suc)(phen)(H2O)](n) (3), and [Zn(suc)(bpy)](n).2nH(2)O (4) (H(2)suc = succinic acid, bpy = 2,2'-bipyridine, and phen = 1,10-phenanthroline). In the isomorphous compounds of 2 and 2a, the metal(II) ions are linked by a bridging succinate ligand to form 1D helix chains in bis-monodentate mode. In compounds 3 and 4, the succinate ligand connects adjacent nickel/zinc(II) atoms through three oxygen atoms from two carboxyl groups, forming an infinite zipper like chain along the a axis. The nickel compound 3 forms a double helix chain through strong hydrogen bonding. Notably, the double-stranded ribbons in compound 4 formed through moderately strong face-to-face pi-pi stacking segregated an unprecedented water chain constructed from dimeric water molecules.